Question

Practice: Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 155.8 kg of Sio2 reacts with 78.3 kg of carbon to produce 66.1 kg of silicon Write a balanced reaction for the process, determine the limiting reactant, theoretical yield, and percent yield. How much (grams) carbon monoxide is released?

I don't understand the step by step process to figuring this out. I don't know how you would calculate percent yield?

Would love answers to all of the questions in part 3!

Thank you!

Answer 1

when SiO2 is heated to melting it reacts with solid carbon to form liquid silicon and carbon monoxide gas The balanced chemical equation can be given as - SiO₂ (s) + 2C (s) - Six) + 2 Co (2) According to the above equation I mol siogie. 60 g siog neactz with 2 mol c ie 2x12= 24 g of Carbon. 1 molar mass of sio = 60 g/mol molar mass of c = 12 g/mol) Thus, mass of sio2 60 8 2.5 mass of c 249 1

Again, given that - 155.8 kg of siog neach with 78.3kg of carbon to prooduce 66.1 kg of silicon Now mass of sio 155.8 kg 155.8810²9 mass of c - 78.3 kg - 78.3 x103 g - 1.99 (215) So here the limiting reactant is | Sida Ane molar mass of si = 28 g/mol Now, acconding to the reaction equation - 60 g of siog react to prooduce 28 g of si. Thus, 155-8 kg = 155.8 x 100 g of

siog react to produce 28 155.88 103 g of si 60 = 72.7 x 103 g of si = 72. 7 kg of si Thus, theoretical yield of som = 72-7 kg Ans Given, actual yield of si = 66.1 kg i Percent yield - Actual yield x 100% Theoretical yield 66-1 kg x 100 % 72.7 kg 190.9 1. Aus 1

from, Go osio, wе bnодиса 2x28 g of co molar mass of co- Thus, from L = 28 g) mot 155.8 kg = 155.8 x103 g of een Sieg we produce 2x 28 x155-8 x103 g = 145.4kg of co The mass of carbon monoxide proo. duce = 145.4 kg) Ans